Program Three: "Dangerous Friends and Friendly Enemies"

Infectious diseases occur when our relationship with microbes changes or when an intruder invades. This hour follows scientists who seek to understand our most personal relationships with the microscopic world, which usually keeps us well but sometimes makes us sick.

Dangerous Friends and Friendly Enemies (Part 6 of 10)

Dr. Stuart Levy and Dr. Fred Koster track a mystery killer from a Navajo community in New Mexico with help from Dr. C.J. Peters with the Centers for Disease Control.

Read more: Dangerous Friends and Friendly Enemies (Part 6 of 10)

A Friendly Enemy (Part 7 of 10)

A look at the common food pathogen called Salmonella and how it spreads. And the hunt for the cause of English Sweating Sickness that once ravaged the English countryside in the 15th and 16th centuries.

Read more: A Friendly Enemy (Part 7 of 10)

Life in a Contaminated World (Part 8 of 10)

In underdeveloped countries, poor conditions increase the risk of disease and scarce medical resources make harder to treat disease properly. Witness how a strain of Hanta virus in Argentina evolves to pass between humans without an intermediate host.

Read more: Life in a Contaminated World (Part 8 of 10)

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